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Apparent Weight

N bullets eac...

Question

\(N\) bullets each of mass \(m~kg\) are fired with a velocity \(v~m/s\) at the rate of \(n\) bullets per second upon a wall. The reaction offered by the wall to the bullets is given by

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Solution

Total mass of bullets \(=Nm\),

Time \(t=\dfrac{N}{n}\)

Momentum of the bullets striking the wall \(=Nmv\)

Rate of change of momentum (Force)
\(=\dfrac{Nmv}{t}=nmv\)

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